1. Air flows at the rate of 1 kg/s through a convergent-divergent nozzle. The entrance area is 2 x 103 m² and the inlet temperature and pressure are 438 K and 580 kPa. If the exit pressure is 140 kPa and the expansion is isentropic, find: a. The velocity at entrance b. The stagnation temperature and stagnation pressure C. The throat and exit areas d. The exit velocity